title: Age effect on vascular reactivity in Type 1 diabetes.
abstract: OBJECTIVE
  The objective of this study was to assess the effect of age on vascular reactivity in patients with Type 1 diabetes.
  
  
  METHODS
  Forty-five patients with Type 1 diabetes and 71 healthy control subjects, divided into three age groups (18-30, 31-45 and 46-60 years old), underwent assessment of vascular reactivity based on ultrasound examination of a brachial artery after nitric oxide donor administration.
  
  
  RESULTS
  The vasodilative and haemodynamic effect was most pronounced in the youngest control subjects, where lumen widening of 0.51 ± 0.16 mm (13.9 ± 4.2%) and increase in early velocity of 28.4 ± 6.5 cm/s (237 ± 55%) were observed, while, in the control subjects from the middle and oldest age groups, the increase in artery diameter was 0.4 ± 0.11 and 0.22 ± 0.12 mm (9.8 ± 2.6 and 5.0 ± 2.6%), respectively. In the youngest patients with diabetes, lumen widening by 0.35 ± 0.13 mm (8.6 ± 3.4%) and increase in early diastolic velocity by 16.9 ± 5.6 cm/s (158 ± 52%) were noted (P < 0.05 vs. control subjects). In patients with diabetes from the middle and oldest age groups, the increase in artery diameter was 0.26 ± 0.06 and 0.16 ± 0.09 mm (5.5 ± 1.4 and 3.2 ± 1.8%), respectively.
  
  
  CONCLUSIONS
  Vascular reactivity is strongly age dependent in all subjects; however, responses are delayed and occur over a longer time period in the patients with diabetes. Vasodilation test protocols should take into account the age of the subjects.
authors.affiliation: Radiology and Diagnostic Imaging Department, Barlicki University Hospital No. 1, Medical University of Lodz, Lodz, Poland.
authors.forename: P
authors.initials: P
authors.lastname: Grzelak
authors.forename: L
authors.initials: L
authors.lastname: Czupryniak
authors.forename: M
authors.initials: M
authors.lastname: Olszycki
authors.forename: A
authors.initials: A
authors.lastname: Majos
authors.forename: L
authors.initials: L
authors.lastname: Stefańczyk
mesh_terms: D000293:Adolescent; D000328:Adult; D000375:Aging / Q000502:physiology*; D001783:Blood Flow Velocity / Q000502:physiology*; D003922:Diabetes Mellitus, Type 1 / Q000000981:diagnostic imaging / Q000378:metabolism / Q000503:physiopathology*; D003925:Diabetic Angiopathies / Q000000981:diagnostic imaging / Q000378:metabolism / Q000503:physiopathology*; D004730:Endothelium, Vascular / Q000000981:diagnostic imaging / Q000378:metabolism / Q000502:physiology*; D005260:Female; D006442:Glycated Hemoglobin / Q000378:metabolism*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000502:physiology; D012307:Risk Factors; D014463:Ultrasonography; D055815:Young Adult
chemical_list: D006442:Glycated Hemoglobin; D009569:Nitric Oxide; C517652:hemoglobin A1c protein, human